Method and apparatus for making insulating board



Aug. 13,1935. A E JR 2,011,183

METHOD AND APPARATUS FOR MAKING INSULATING BOARD Filed April 11, 1935 IN V EN TOR. Q4 l/ID H. 947725650 J9.

HIS A TTORNEY ORYIR Patented Aug. 13, 1935 o sTA'rss iun'rnou Alva arraaarps ran a INSULATING BQARD lhavid id. Patterson, in, San Francisco, 2' Application April ill, 1933, Serial No. 665,4l'ld d Clams. (Cl. lit-28) i apparatus for carrying out the method embodying my invention.

The invention possesses other objects and features of advantage, someoi which, with the foregoing, will be set iorth in the following descrip tion of my invention. It is to be understood that I do not limit myself to this disclosure of species of my invention, as I may adopt variant embodiing insulating board embodying my invention comprises feeding a plurality of sheets along a path with the sheets superimposed one above the other. During the travel of the sheets, one of the intermediate sheets is corrugated, and an adhesive is applied between the corrugated sheet and an adjacent sheet. A cementitious filler is deposited between the corrugated sheet and another of the sheets, and a predetermined pressure is then applied to the traveling web of superimposed. sheets to form the same into a composite board of determined thickness. The board is then allowed to continue unmolested along its path of movement until the filler has had opportunity to set. At a succeeding point along its path of movement the board is cut into sections. The sections are then subjected to drying for eliminating the moisture.

The apparatus for carrying out the method embodying my invention preferably comprises means for holding a plurality of supply rolls of sheet material, and means for continuously withdrawing the sheets from the rolls and advancing the same along a path with tlfe sheets superimposed one over the other.

55 between the corrugated sheet and another 01 the In terms of broad inclusion, the method of mak Means are provided for cor I ru'gating an intermediate one of the sheets, andsheets. Means" disposed along the path of movement of the superimposed sheets are provided for applying pressure thereto to form the same into a composite board, and means are provided for adjusting the pressure on the sheets to control the thickness of the board. Means movable along the V path of movement of the board are also provided for cutting the latter in sections.

In greater detail, and referring to Figure l o the drawing, a form of apparatus embodying the improvements of my invention comprises a frame 2 providing support for a pair of supply rolls and d of suitable sheet material. The sheet or strip from the upper supply roll passes between a pair of toothed rollers ii and then over a gluing roll '5. The rollers t operate to corrugate the sheet and the roll 7 functions to apply an adhesive fluid to the lower ridges of the corrugations in the sheet. From the gluing roll i the corrugated sheet 8 passes toward a pair of pressure rollers, the upper roll t of which is toothed and the lower roll it of which is smooth.

The strip 62 from the lower supply roll is suitably guided toward the rollers d and ii, and together with the corrugated strip a is directed between the pressure rollers. The latter rollers press the sheets together and function to efiect a secure bond therebetween by the adhesive which was applied to the corrugated sheet 8. The teeth provided in the upper pressure roll ti permit the sheets to be pressed together without disturbing the corrugations in the upper sheet.

From the pressure rollers the united sheets 8 and it continue along their path of movement and pass over the top of a suitable table it at which point a oementitlous filler is deposited on 1 p the upper surface of the corrugated sheet 8. Any

suitable means, such as the hopper it, may be provided for dispensing the filling material it.

The layer l1 of filling material spaces the upper set of sheets from the lower and secures the two sets together. The mechanism in the secondary unit I8 is arranged so that the corrugated sheet IQ is adheslvely'united to the underside of the plain sheet 2i. Thus, when the united sheets are subsequently applied over the underlying sheets 8 and I2, the corrugated sheet it will contact the filling layer ll.

Means are also provided along the path of movement of the traveling web for pressing the superimposed sheets together to form the same .into a composite board of predetermined thickness. This is accomplished by a pair of pressure rolls 22, one of which is adjustable by a suitable hand wheel 23 so that the rollers may be adjusted relative to the amount of their separation. Obviously the thickness of the board will depend upon I the amount of this separation.

After emerging from between the pressure rolls 22 the composite board travels on a conveyor 2 for a sufficient length of time to allow the filler to set. The length of this conveyor will depend of course upon the amount of time which the filler requires to set. After coming off the conveyor 24 the board passes through a suitable cut-01f device 26 which operates to cut the board into sections. The knife 2'5 of the cut-off device is mounted for travel along the path of movement of the board and in time with the movement of the latter so that the board is cut during its travel.

After passing from the cut-off device, the sections of board are carried on a conveyor 2% through a suitable dryer 29 in which moisture is evaporated from the board sections.

From the above description of a form of apparatus embodying my invention it will be seen that the method of fabricating the. sections of insulating board is by a continuous process. The several strips which go to make up the product are peeled continuously from the supply rolls and all of the operations performed on and in conjunction with these sheets take place at successive stations along the path of movement of the sheets. It will be seen that the steps in the method of making the insulating board comprise those of continuously feeding a plurality of sheets along a path with the sheets superimposed one above the other, corrugating an intermediate one of the sheets, applying an adhesive between the corrugated sheets and an adjacent sheet, depositing a filler between the corrugated sheet and another of the sheets, applying pressure to the superimposed sheets, allowing the adhesive materials to set, cutting the resulting board into sections, and finally drying out the sections.

The product resulting from the particular apparatus illustrated in Figure 1 is shown in side elevation in Figure 2. The two outer sheets i2. and 2i are plain sheets, and the two inner sheets 8 and B9 are corrugated, while the filling layer H is interposed between the two corrugated sheets. The transverse air channels 3i provided with rosin size to render the same more resistant to the passage of moisture.

It will be appreciated that the particular type of insulating board construction shown in Figure 2 is merely one of several forms which the product may take. For example, one of the corrugated sheets may be omitted, thus leaving a plain sheet against one side of the core H. To produce such a board in the apparatus of my invention the corrugated sheet i9 is omitted at the unit it, and the plain sheet 2i is merely lowered into engagement with the top surface of the filling layer ll.

I claim:

1. The method of making insulating board whichcomprises gluing a corrugated sheet to a flat sheet, and then depositing a filler on the glued corrugated sheet, whereby the corrugated sheet is prevented from flattening out under the load of said filler.

2. The method of making insulating board which comprises gluing a corrugated sheet to a flat sheet, depositing a filler on the glued corrugated sheet, laying another sheet on the filler, and then applying pressure to the sheets to form the whole into a composite board, whereby the corrugated sheet is. prevented from flattening out under the load of the filler and the subsequently applied pressure.

3. Apparatus for making insulating board comprising meansfor feeding a flat sheet along a path, means for gluing a corrugated sheet to the flat sheet, and means for depositing a filler on the glued corrugated sheet, whereby the corrugated 

